Create a multi-line text rich-text control with a certain wrap mode
Enables font and color settings on windows, while being equal to textCtrl
on other platforms. Note: the wrap and alignment
have to be set at creation time or the default to WrapNone and AlignLeft respectively.

Process enter key events, used in a comboBox or textCtrl and
catched using a oncommand handler.
(otherwise pressing Enter is either processed
internally by the control or used for navigation between dialog controls).

Create MediaCtrl with choosing back-end. This is useful to select back-end on
Windows. But if you don't want to cause any effect to other platforms, you must
use wxToolkit or #ifdef macro to choose correct function for platforms.
For example,